## 左边的线没有查完，才会去查右边的值。
## 顺序应该是： A B D C E

class E:
    # age = 'e'
    pass

class D:
    age = 'd'
    pass

class C(E):
    age = 'c'
    pass

class B(D):
    # age = 'b'
    pass


class A(B, C):
    # age = 'a'
    pass

a = A()
print(a.age) # d


